drivers/char/drm/drm_vm.c

   1 /**
   2  * \file drm_vm.c
   3  * Memory mapping for DRM
   4  *
   5  * \author Rickard E. (Rik) Faith <faith@valinux.com>
   6  * \author Gareth Hughes <gareth@valinux.com>
   7  */
   8
   9 /*
  10  * Created: Mon Jan  4 08:58:31 1999 by faith@valinux.com
  11  *
  12  * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
  13  * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
  14  * All Rights Reserved.
  15  *
  16  * Permission is hereby granted, free of charge, to any person obtaining a
  17  * copy of this software and associated documentation files (the "Software"),
  18  * to deal in the Software without restriction, including without limitation
  19  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  20  * and/or sell copies of the Software, and to permit persons to whom the
  21  * Software is furnished to do so, subject to the following conditions:
  22  *
  23  * The above copyright notice and this permission notice (including the next
  24  * paragraph) shall be included in all copies or substantial portions of the
  25  * Software.
  26  *
  27  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  28  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  29  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  30  * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  31  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  32  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  33  * OTHER DEALINGS IN THE SOFTWARE.
  34  */
  35
  36 #include "drmP.h"
  37 #if defined(__ia64__)
  38 #include <linux/efi.h>
  39 #endif
  40
  41 static void drm_vm_open(struct vm_area_struct *vma);
  42 static void drm_vm_close(struct vm_area_struct *vma);
  43
  44 /**
  45  * \c nopage method for AGP virtual memory.
  46  *
  47  * \param vma virtual memory area.
  48  * \param address access address.
  49  * \return pointer to the page structure.
  50  *
  51  * Find the right map and if it's AGP memory find the real physical page to
  52  * map, get the page, increment the use count and return it.
  53  */
  54 #if __OS_HAS_AGP
  55 static __inline__ struct page *drm_do_vm_nopage(struct vm_area_struct *vma,
  56                                                 unsigned long address)
  57 {
  58         drm_file_t *priv = vma->vm_file->private_data;
  59         drm_device_t *dev = priv->head->dev;
  60         drm_map_t *map = NULL;
  61         drm_map_list_t *r_list;
  62         drm_hash_item_t *hash;
  63
  64         /*
  65          * Find the right map
  66          */
  67         if (!drm_core_has_AGP(dev))
  68                 goto vm_nopage_error;
  69
  70         if (!dev->agp || !dev->agp->cant_use_aperture)
  71                 goto vm_nopage_error;
  72
  73         if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff << PAGE_SHIFT, &hash))
  74                 goto vm_nopage_error;
  75
  76         r_list = drm_hash_entry(hash, drm_map_list_t, hash);
  77         map = r_list->map;
  78
  79         if (map && map->type == _DRM_AGP) {
  80                 unsigned long offset = address - vma->vm_start;
  81                 unsigned long baddr = map->offset + offset;
  82                 struct drm_agp_mem *agpmem;
  83                 struct page *page;
  84
  85 #ifdef __alpha__
  86                 /*
  87                  * Adjust to a bus-relative address
  88                  */
  89                 baddr -= dev->hose->mem_space->start;
  90 #endif
  91
  92                 /*
  93                  * It's AGP memory - find the real physical page to map
  94                  */
  95                 for (agpmem = dev->agp->memory; agpmem; agpmem = agpmem->next) {
  96                         if (agpmem->bound <= baddr &&
  97                             agpmem->bound + agpmem->pages * PAGE_SIZE > baddr)
  98                                 break;
  99                 }
 100
 101                 if (!agpmem)
 102                         goto vm_nopage_error;
 103
 104                 /*
 105                  * Get the page, inc the use count, and return it
 106                  */
 107                 offset = (baddr - agpmem->bound) >> PAGE_SHIFT;
 108                 page = virt_to_page(__va(agpmem->memory->memory[offset]));
 109                 get_page(page);
 110
 111                 DRM_DEBUG
 112                     ("baddr = 0x%lx page = 0x%p, offset = 0x%lx, count=%d\n",
 113                      baddr, __va(agpmem->memory->memory[offset]), offset,
 114                      page_count(page));
 115
 116                 return page;
 117         }
 118       vm_nopage_error:
 119         return NOPAGE_SIGBUS;   /* Disallow mremap */
 120 }
 121 #else                           /* __OS_HAS_AGP */
 122 static __inline__ struct page *drm_do_vm_nopage(struct vm_area_struct *vma,
 123                                                 unsigned long address)
 124 {
 125         return NOPAGE_SIGBUS;
 126 }
 127 #endif                          /* __OS_HAS_AGP */
 128
 129 /**
 130  * \c nopage method for shared virtual memory.
 131  *
 132  * \param vma virtual memory area.
 133  * \param address access address.
 134  * \return pointer to the page structure.
 135  *
 136  * Get the the mapping, find the real physical page to map, get the page, and
 137  * return it.
 138  */
 139 static __inline__ struct page *drm_do_vm_shm_nopage(struct vm_area_struct *vma,
 140                                                     unsigned long address)
 141 {
 142         drm_map_t *map = (drm_map_t *) vma->vm_private_data;
 143         unsigned long offset;
 144         unsigned long i;
 145         struct page *page;
 146
 147         if (address > vma->vm_end)
 148                 return NOPAGE_SIGBUS;   /* Disallow mremap */
 149         if (!map)
 150                 return NOPAGE_OOM;      /* Nothing allocated */
 151
 152         offset = address - vma->vm_start;
 153         i = (unsigned long)map->handle + offset;
 154         page = (map->type == _DRM_CONSISTENT) ?
 155                 virt_to_page((void *)i) : vmalloc_to_page((void *)i);
 156         if (!page)
 157                 return NOPAGE_OOM;
 158         get_page(page);
 159
 160         DRM_DEBUG("shm_nopage 0x%lx\n", address);
 161         return page;
 162 }
 163
 164 /**
 165  * \c close method for shared virtual memory.
 166  *
 167  * \param vma virtual memory area.
 168  *
 169  * Deletes map information if we are the last
 170  * person to close a mapping and it's not in the global maplist.
 171  */
 172 static void drm_vm_shm_close(struct vm_area_struct *vma)
 173 {
 174         drm_file_t *priv = vma->vm_file->private_data;
 175         drm_device_t *dev = priv->head->dev;
 176         drm_vma_entry_t *pt, *prev, *next;
 177         drm_map_t *map;
 178         drm_map_list_t *r_list;
 179         struct list_head *list;
 180         int found_maps = 0;
 181
 182         DRM_DEBUG("0x%08lx,0x%08lx\n",
 183                   vma->vm_start, vma->vm_end - vma->vm_start);
 184         atomic_dec(&dev->vma_count);
 185
 186         map = vma->vm_private_data;
 187
 188         mutex_lock(&dev->struct_mutex);
 189         for (pt = dev->vmalist, prev = NULL; pt; pt = next) {
 190                 next = pt->next;
 191                 if (pt->vma->vm_private_data == map)
 192                         found_maps++;
 193                 if (pt->vma == vma) {
 194                         if (prev) {
 195                                 prev->next = pt->next;
 196                         } else {
 197                                 dev->vmalist = pt->next;
 198                         }
 199                         drm_free(pt, sizeof(*pt), DRM_MEM_VMAS);
 200                 } else {
 201                         prev = pt;
 202                 }
 203         }
 204         /* We were the only map that was found */
 205         if (found_maps == 1 && map->flags & _DRM_REMOVABLE) {
 206                 /* Check to see if we are in the maplist, if we are not, then
 207                  * we delete this mappings information.
 208                  */
 209                 found_maps = 0;
 210                 list = &dev->maplist->head;
 211                 list_for_each(list, &dev->maplist->head) {
 212                         r_list = list_entry(list, drm_map_list_t, head);
 213                         if (r_list->map == map)
 214                                 found_maps++;
 215                 }
 216
 217                 if (!found_maps) {
 218                         drm_dma_handle_t dmah;
 219
 220                         switch (map->type) {
 221                         case _DRM_REGISTERS:
 222                         case _DRM_FRAME_BUFFER:
 223                                 if (drm_core_has_MTRR(dev) && map->mtrr >= 0) {
 224                                         int retcode;
 225                                         retcode = mtrr_del(map->mtrr,
 226                                                            map->offset,
 227                                                            map->size);
 228                                         DRM_DEBUG("mtrr_del = %d\n", retcode);
 229                                 }
 230                                 drm_ioremapfree(map->handle, map->size, dev);
 231                                 break;
 232                         case _DRM_SHM:
 233                                 vfree(map->handle);
 234                                 break;
 235                         case _DRM_AGP:
 236                         case _DRM_SCATTER_GATHER:
 237                                 break;
 238                         case _DRM_CONSISTENT:
 239                                 dmah.vaddr = map->handle;
 240                                 dmah.busaddr = map->offset;
 241                                 dmah.size = map->size;
 242                                 __drm_pci_free(dev, &dmah);
 243                                 break;
 244                         }
 245                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 246                 }
 247         }
 248         mutex_unlock(&dev->struct_mutex);
 249 }
 250
 251 /**
 252  * \c nopage method for DMA virtual memory.
 253  *
 254  * \param vma virtual memory area.
 255  * \param address access address.
 256  * \return pointer to the page structure.
 257  *
 258  * Determine the page number from the page offset and get it from drm_device_dma::pagelist.
 259  */
 260 static __inline__ struct page *drm_do_vm_dma_nopage(struct vm_area_struct *vma,
 261                                                     unsigned long address)
 262 {
 263         drm_file_t *priv = vma->vm_file->private_data;
 264         drm_device_t *dev = priv->head->dev;
 265         drm_device_dma_t *dma = dev->dma;
 266         unsigned long offset;
 267         unsigned long page_nr;
 268         struct page *page;
 269
 270         if (!dma)
 271                 return NOPAGE_SIGBUS;   /* Error */
 272         if (address > vma->vm_end)
 273                 return NOPAGE_SIGBUS;   /* Disallow mremap */
 274         if (!dma->pagelist)
 275                 return NOPAGE_OOM;      /* Nothing allocated */
 276
 277         offset = address - vma->vm_start;       /* vm_[pg]off[set] should be 0 */
 278         page_nr = offset >> PAGE_SHIFT;
 279         page = virt_to_page((dma->pagelist[page_nr] + (offset & (~PAGE_MASK))));
 280
 281         get_page(page);
 282
 283         DRM_DEBUG("dma_nopage 0x%lx (page %lu)\n", address, page_nr);
 284         return page;
 285 }
 286
 287 /**
 288  * \c nopage method for scatter-gather virtual memory.
 289  *
 290  * \param vma virtual memory area.
 291  * \param address access address.
 292  * \return pointer to the page structure.
 293  *
 294  * Determine the map offset from the page offset and get it from drm_sg_mem::pagelist.
 295  */
 296 static __inline__ struct page *drm_do_vm_sg_nopage(struct vm_area_struct *vma,
 297                                                    unsigned long address)
 298 {
 299         drm_map_t *map = (drm_map_t *) vma->vm_private_data;
 300         drm_file_t *priv = vma->vm_file->private_data;
 301         drm_device_t *dev = priv->head->dev;
 302         drm_sg_mem_t *entry = dev->sg;
 303         unsigned long offset;
 304         unsigned long map_offset;
 305         unsigned long page_offset;
 306         struct page *page;
 307
 308         if (!entry)
 309                 return NOPAGE_SIGBUS;   /* Error */
 310         if (address > vma->vm_end)
 311                 return NOPAGE_SIGBUS;   /* Disallow mremap */
 312         if (!entry->pagelist)
 313                 return NOPAGE_OOM;      /* Nothing allocated */
 314
 315         offset = address - vma->vm_start;
 316         map_offset = map->offset - (unsigned long)dev->sg->virtual;
 317         page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT);
 318         page = entry->pagelist[page_offset];
 319         get_page(page);
 320
 321         return page;
 322 }
 323
 324 static struct page *drm_vm_nopage(struct vm_area_struct *vma,
 325                                   unsigned long address, int *type)
 326 {
 327         if (type)
 328                 *type = VM_FAULT_MINOR;
 329         return drm_do_vm_nopage(vma, address);
 330 }
 331
 332 static struct page *drm_vm_shm_nopage(struct vm_area_struct *vma,
 333                                       unsigned long address, int *type)
 334 {
 335         if (type)
 336                 *type = VM_FAULT_MINOR;
 337         return drm_do_vm_shm_nopage(vma, address);
 338 }
 339
 340 static struct page *drm_vm_dma_nopage(struct vm_area_struct *vma,
 341                                       unsigned long address, int *type)
 342 {
 343         if (type)
 344                 *type = VM_FAULT_MINOR;
 345         return drm_do_vm_dma_nopage(vma, address);
 346 }
 347
 348 static struct page *drm_vm_sg_nopage(struct vm_area_struct *vma,
 349                                      unsigned long address, int *type)
 350 {
 351         if (type)
 352                 *type = VM_FAULT_MINOR;
 353         return drm_do_vm_sg_nopage(vma, address);
 354 }
 355
 356 /** AGP virtual memory operations */
 357 static struct vm_operations_struct drm_vm_ops = {
 358         .nopage = drm_vm_nopage,
 359         .open = drm_vm_open,
 360         .close = drm_vm_close,
 361 };
 362
 363 /** Shared virtual memory operations */
 364 static struct vm_operations_struct drm_vm_shm_ops = {
 365         .nopage = drm_vm_shm_nopage,
 366         .open = drm_vm_open,
 367         .close = drm_vm_shm_close,
 368 };
 369
 370 /** DMA virtual memory operations */
 371 static struct vm_operations_struct drm_vm_dma_ops = {
 372         .nopage = drm_vm_dma_nopage,
 373         .open = drm_vm_open,
 374         .close = drm_vm_close,
 375 };
 376
 377 /** Scatter-gather virtual memory operations */
 378 static struct vm_operations_struct drm_vm_sg_ops = {
 379         .nopage = drm_vm_sg_nopage,
 380         .open = drm_vm_open,
 381         .close = drm_vm_close,
 382 };
 383
 384 /**
 385  * \c open method for shared virtual memory.
 386  *
 387  * \param vma virtual memory area.
 388  *
 389  * Create a new drm_vma_entry structure as the \p vma private data entry and
 390  * add it to drm_device::vmalist.
 391  */
 392 static void drm_vm_open(struct vm_area_struct *vma)
 393 {
 394         drm_file_t *priv = vma->vm_file->private_data;
 395         drm_device_t *dev = priv->head->dev;
 396         drm_vma_entry_t *vma_entry;
 397
 398         DRM_DEBUG("0x%08lx,0x%08lx\n",
 399                   vma->vm_start, vma->vm_end - vma->vm_start);
 400         atomic_inc(&dev->vma_count);
 401
 402         vma_entry = drm_alloc(sizeof(*vma_entry), DRM_MEM_VMAS);
 403         if (vma_entry) {
 404                 mutex_lock(&dev->struct_mutex);
 405                 vma_entry->vma = vma;
 406                 vma_entry->next = dev->vmalist;
 407                 vma_entry->pid = current->pid;
 408                 dev->vmalist = vma_entry;
 409                 mutex_unlock(&dev->struct_mutex);
 410         }
 411 }
 412
 413 /**
 414  * \c close method for all virtual memory types.
 415  *
 416  * \param vma virtual memory area.
 417  *
 418  * Search the \p vma private data entry in drm_device::vmalist, unlink it, and
 419  * free it.
 420  */
 421 static void drm_vm_close(struct vm_area_struct *vma)
 422 {
 423         drm_file_t *priv = vma->vm_file->private_data;
 424         drm_device_t *dev = priv->head->dev;
 425         drm_vma_entry_t *pt, *prev;
 426
 427         DRM_DEBUG("0x%08lx,0x%08lx\n",
 428                   vma->vm_start, vma->vm_end - vma->vm_start);
 429         atomic_dec(&dev->vma_count);
 430
 431         mutex_lock(&dev->struct_mutex);
 432         for (pt = dev->vmalist, prev = NULL; pt; prev = pt, pt = pt->next) {
 433                 if (pt->vma == vma) {
 434                         if (prev) {
 435                                 prev->next = pt->next;
 436                         } else {
 437                                 dev->vmalist = pt->next;
 438                         }
 439                         drm_free(pt, sizeof(*pt), DRM_MEM_VMAS);
 440                         break;
 441                 }
 442         }
 443         mutex_unlock(&dev->struct_mutex);
 444 }
 445
 446 /**
 447  * mmap DMA memory.
 448  *
 449  * \param filp file pointer.
 450  * \param vma virtual memory area.
 451  * \return zero on success or a negative number on failure.
 452  *
 453  * Sets the virtual memory area operations structure to vm_dma_ops, the file
 454  * pointer, and calls vm_open().
 455  */
 456 static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma)
 457 {
 458         drm_file_t *priv = filp->private_data;
 459         drm_device_t *dev;
 460         drm_device_dma_t *dma;
 461         unsigned long length = vma->vm_end - vma->vm_start;
 462
 463         lock_kernel();
 464         dev = priv->head->dev;
 465         dma = dev->dma;
 466         DRM_DEBUG("start = 0x%lx, end = 0x%lx, offset = 0x%lx\n",
 467                   vma->vm_start, vma->vm_end, vma->vm_pgoff << PAGE_SHIFT);
 468
 469         /* Length must match exact page count */
 470         if (!dma || (length >> PAGE_SHIFT) != dma->page_count) {
 471                 unlock_kernel();
 472                 return -EINVAL;
 473         }
 474         unlock_kernel();
 475
 476         vma->vm_ops = &drm_vm_dma_ops;
 477
 478         vma->vm_flags |= VM_RESERVED;   /* Don't swap */
 479
 480         vma->vm_file = filp;    /* Needed for drm_vm_open() */
 481         drm_vm_open(vma);
 482         return 0;
 483 }
 484
 485 unsigned long drm_core_get_map_ofs(drm_map_t * map)
 486 {
 487         return map->offset;
 488 }
 489
 490 EXPORT_SYMBOL(drm_core_get_map_ofs);
 491
 492 unsigned long drm_core_get_reg_ofs(struct drm_device *dev)
 493 {
 494 #ifdef __alpha__
 495         return dev->hose->dense_mem_base - dev->hose->mem_space->start;
 496 #else
 497         return 0;
 498 #endif
 499 }
 500
 501 EXPORT_SYMBOL(drm_core_get_reg_ofs);
 502
 503 /**
 504  * mmap DMA memory.
 505  *
 506  * \param filp file pointer.
 507  * \param vma virtual memory area.
 508  * \return zero on success or a negative number on failure.
 509  *
 510  * If the virtual memory area has no offset associated with it then it's a DMA
 511  * area, so calls mmap_dma(). Otherwise searches the map in drm_device::maplist,
 512  * checks that the restricted flag is not set, sets the virtual memory operations
 513  * according to the mapping type and remaps the pages. Finally sets the file
 514  * pointer and calls vm_open().
 515  */
 516 int drm_mmap(struct file *filp, struct vm_area_struct *vma)
 517 {
 518         drm_file_t *priv = filp->private_data;
 519         drm_device_t *dev = priv->head->dev;
 520         drm_map_t *map = NULL;
 521         unsigned long offset = 0;
 522         drm_hash_item_t *hash;
 523
 524         DRM_DEBUG("start = 0x%lx, end = 0x%lx, offset = 0x%lx\n",
 525                   vma->vm_start, vma->vm_end, vma->vm_pgoff << PAGE_SHIFT);
 526
 527         if (!priv->authenticated)
 528                 return -EACCES;
 529
 530         /* We check for "dma". On Apple's UniNorth, it's valid to have
 531          * the AGP mapped at physical address 0
 532          * --BenH.
 533          */
 534         if (!(vma->vm_pgoff << PAGE_SHIFT)
 535 #if __OS_HAS_AGP
 536             && (!dev->agp
 537                 || dev->agp->agp_info.device->vendor != PCI_VENDOR_ID_APPLE)
 538 #endif
 539             )
 540                 return drm_mmap_dma(filp, vma);
 541
 542         if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff << PAGE_SHIFT, &hash)) {
 543                 DRM_ERROR("Could not find map\n");
 544                 return -EINVAL;
 545         }
 546
 547         map = drm_hash_entry(hash, drm_map_list_t, hash)->map;
 548         if (!map || ((map->flags & _DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN)))
 549                 return -EPERM;
 550
 551         /* Check for valid size. */
 552         if (map->size != vma->vm_end - vma->vm_start)
 553                 return -EINVAL;
 554
 555         if (!capable(CAP_SYS_ADMIN) && (map->flags & _DRM_READ_ONLY)) {
 556                 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
 557 #if defined(__i386__) || defined(__x86_64__)
 558                 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
 559 #else
 560                 /* Ye gads this is ugly.  With more thought
 561                    we could move this up higher and use
 562                    `protection_map' instead.  */
 563                 vma->vm_page_prot =
 564                     __pgprot(pte_val
 565                              (pte_wrprotect
 566                               (__pte(pgprot_val(vma->vm_page_prot)))));
 567 #endif
 568         }
 569
 570         switch (map->type) {
 571         case _DRM_AGP:
 572                 if (drm_core_has_AGP(dev) && dev->agp->cant_use_aperture) {
 573                         /*
 574                          * On some platforms we can't talk to bus dma address from the CPU, so for
 575                          * memory of type DRM_AGP, we'll deal with sorting out the real physical
 576                          * pages and mappings in nopage()
 577                          */
 578 #if defined(__powerpc__)
 579                         pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
 580 #endif
 581                         vma->vm_ops = &drm_vm_ops;
 582                         break;
 583                 }
 584                 /* fall through to _DRM_FRAME_BUFFER... */
 585         case _DRM_FRAME_BUFFER:
 586         case _DRM_REGISTERS:
 587 #if defined(__i386__) || defined(__x86_64__)
 588                 if (boot_cpu_data.x86 > 3 && map->type != _DRM_AGP) {
 589                         pgprot_val(vma->vm_page_prot) |= _PAGE_PCD;
 590                         pgprot_val(vma->vm_page_prot) &= ~_PAGE_PWT;
 591                 }
 592 #elif defined(__powerpc__)
 593                 pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
 594                 if (map->type == _DRM_REGISTERS)
 595                         pgprot_val(vma->vm_page_prot) |= _PAGE_GUARDED;
 596 #endif
 597                 vma->vm_flags |= VM_IO; /* not in core dump */
 598 #if defined(__ia64__)
 599                 if (efi_range_is_wc(vma->vm_start, vma->vm_end - vma->vm_start))
 600                         vma->vm_page_prot =
 601                             pgprot_writecombine(vma->vm_page_prot);
 602                 else
 603                         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 604 #endif
 605                 offset = dev->driver->get_reg_ofs(dev);
 606 #ifdef __sparc__
 607                 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 608                 if (io_remap_pfn_range(vma, vma->vm_start,
 609                                        (map->offset + offset) >> PAGE_SHIFT,
 610                                        vma->vm_end - vma->vm_start,
 611                                        vma->vm_page_prot))
 612 #else
 613                 if (io_remap_pfn_range(vma, vma->vm_start,
 614                                        (map->offset + offset) >> PAGE_SHIFT,
 615                                        vma->vm_end - vma->vm_start,
 616                                        vma->vm_page_prot))
 617 #endif
 618                         return -EAGAIN;
 619                 DRM_DEBUG("   Type = %d; start = 0x%lx, end = 0x%lx,"
 620                           " offset = 0x%lx\n",
 621                           map->type,
 622                           vma->vm_start, vma->vm_end, map->offset + offset);
 623                 vma->vm_ops = &drm_vm_ops;
 624                 break;
 625         case _DRM_SHM:
 626         case _DRM_CONSISTENT:
 627                 /* Consistent memory is really like shared memory. It's only
 628                  * allocate in a different way */
 629                 vma->vm_ops = &drm_vm_shm_ops;
 630                 vma->vm_private_data = (void *)map;
 631                 /* Don't let this area swap.  Change when
 632                    DRM_KERNEL advisory is supported. */
 633                 vma->vm_flags |= VM_RESERVED;
 634                 break;
 635         case _DRM_SCATTER_GATHER:
 636                 vma->vm_ops = &drm_vm_sg_ops;
 637                 vma->vm_private_data = (void *)map;
 638                 vma->vm_flags |= VM_RESERVED;
 639                 break;
 640         default:
 641                 return -EINVAL; /* This should never happen. */
 642         }
 643         vma->vm_flags |= VM_RESERVED;   /* Don't swap */
 644
 645         vma->vm_file = filp;    /* Needed for drm_vm_open() */
 646         drm_vm_open(vma);
 647         return 0;
 648 }
 649
 650 EXPORT_SYMBOL(drm_mmap);